Screw-secured article and process of producing same.



A, v. BRIESEN. SCREW 320mm; ARTICLE AND PROCESS OF PRODUCING SAME. MPPLIGATIOE FILED DEC. 30, 1910.

Patented May 16, 1911 J wue/W oz W17 M 2%,; flitom vmj' mif%w.. mgmlwm FIB Q 2 Elm UNITED STATES PATENT OFFICE.

ARTHUR v. BRIESEN, OF NEW YORK, N.

SCREW-SECURED ARTICLE AND PROCESS OF PRODUCING Specification of Letters Patent. Patented May 16, 1911.

Application filed December 30, 1910. Serial No. 600,053..

through anintervening doubly corrugated thin annular layer of glass; and it also comprises a process of producing such articles wherein a screw is filmed with a waterglass solution, is inserted in a properly threaded socket and the assemblage is allowed to dry; all'as more fully hereinafter set forth and as claimed.

In many articles made of or employing the noble metals, gold, silver and platinum,

it is necessary to employ small fine-threaded screws of these metals in attaching part to part; and the unions secured are not always as firm and permanent as is desirable. The smaller a" screw the finer and thinner of course is the layer of metal constituting the thread and the less its strength and stifi'ncss.

The noble metals are relatively soft and weak, and they are not much iinproved in this respect by alloying with copper, the

usual metal used for alloying. No such stilt,

strong, shape-retaining fine thread can be produced on any small screw of gold, silver, platinum or copper or their mutual alloys as can be produced on steel, for example. Even wit-h relatively strong brasses and bronzes fine screw threads are easily marred and defaced. Small screw-threaded parts and elements of these relatively soft metals a re, however, a necessity for many purposes, as in the mountings of eyeglass and spectacle lenses, in dcmouutable gem settings, in composite lockets, and many other ewclry artieles. Taking a pair of eyeglasses for instance, several screw-threaded unions may be necessary, as in the two lens-clamps, and, sometimes, also in the nose-piece; in a pair of spectacles, ordinarily thereare threaded unions at the hinges of the bows, etc. All these screws must be very small, carrying a line thread and they must be of a noble metal, very little hardened or slifi'cnedby alloying with copper or the like. -The result is that the. working, loose of these small screw threaded unions is a constant source,

of annoyance and loss. No matter how accurately the threads may fit at first, in thecourse of time they become defaced, dented and misshapen with the result of a loose union. The strains upon lens-mountings and jewelry articles incident to wear and'use tend to make the comparatively soft metal in the thin layer of the screw thread flow and yield and lose its-sharpness of outline so that the screw union is no longer firm. And

one or two removals and replacements by v the screw driver are apt to have the same effect.

In the resent invention Iliave devised a;

way of 0 viating the noteddifliculties and permitting the use of screws of the relatively soft noble metals while still securing a firm and permanent union no matter what the de facement of the screw incident to wear or use of removal may be. For this pur ose, before msettmg the screw 1n its socket, di

' it in a solution of water-glass. Waterglass 1s silicate of potash or silicateof soda, or a mixture of both, and comes-into'commerce. 1n the form of a strong syrupy solution in water. This water solution exposed to the air and dried down in thin films is not very permanent since it takes up .carbon dioxid which is apt to make it eliloresce. In other I situations exposed to air, as whenused to impregnate fibrous material, it is also apt t6 efflorcsce. It dries down however in the first instance to a hard, glassy layer, not much different from ordinary glass. The dried water-glass is not hygroscopic and is not soluble to any extent in water at ordinary temperatures. Itis not softened or altered by ordinary changes of temperature. By covering a screw thread with a solution of waterglass, which may be strong or dilute as preferred, and then insetting the screw, the waterglass dries down between the two threads to form a glassy, hard doubly corrugated annularbond layer therebetween spacing and uniting with a. firm union the two coiiperating parts; and as the air is not able to gain access to or atfect this layer,- it retains'its glassy nature fora long period of time, in factindefinitely. Theunion it forms between the threads is permanent for all purposes; it is strong, stiff, and unyielding. There is a layer of glass between the two metal surfaces. Obviously, with layer present the actual shape of either- 'screw thread and, consequently, its fit, he-

comes a matter ot'indilt'ereiu'r as long as the one thread will enter the other. At the same time tlns union not so strong but that it is readily broken by the screw driver,

moderate force.

glass between the :crew threads, the screw threads in the present invention may even be so defaced that they fail to engage each other accurately and become merely ameans of securing registry. In other words, the

present process may be applied to existing articles which have worked loose to produce a firm and permanent union.

In the accompanying illustration I have shown, more or less diagrammatically, cer- 5 tain embodiments of the described invention.

Figure l is a fragmentary view of aneycglass showing screw connected elements;

Fig. 2 is a sectional view on an enlarged scale showing the screw connected elements 3t with the bonding layer of glass therebetween; Fig. 3 is a fragmentary plan View of the screw connection in another form of eyeglass or spectacle; Fig. 4 is a sectional fragmentary view on line 4-4 with one clement in elevation of the showing in Fig. 0;

Fig. 5 is a detail view on a greatly enlarged scale showing two threaded metal elements with an intervening corrugated layer of hardened glass. therebetween and uniting the same;- Fig. 6 is a detail view of a screw wetted wlth waterglass solution and ready for inscttin and Fi 7 is a sectional view t3 7 b of a stick pin mounting.

In the showing of Fig. 1, element 1 is the 5 usual nose piece united to lug 2 by a screw 3,

said lug carrying as usual, rim '4: of lens 5. In Fig. 2 the elements shown are the same i but the showing is on auenlarged scale and in section, permitting the illustration of the doubly corrugated annular layer of hardened glass 6 uniting the two threaded rle .ilents.

In Figs. 3 and 4 the lens ls carr ed by mounting. 7 provided with two straps 8 through 9 lice being usually, as shown, of materiallywhich passes the 'screw When the screw is placed in position the two I straps'aro drawn together holding the edge of the lens firmly therebet'ween. The screw passes through orifice 9 in the lens, this ori- *'lar'gc r diameter than the metal screw. This prevents breaking of the lens by expansion of the screw through heat changes. .Layer t 10 of hardened-glass unites the thread of the screw with the thread of the lower strap.

Element 11 is the usual bow or car piece pivotally connected at 12 to the mounting.

The view in Fig. 5 shows on an enlarged scale two threaded metal elements 13 and 14 connected by the intervening bonding doubly corrugated hardened glass annulus 15; and it may be taken as a sectional view of the threaded connection in Fig. 4- or in Fig. 2.

In Fig. 6 is shown a section of a screw 16 having thread 18 covered with a thin wetting layer 19 of watcrglass solution.

In Fig. 7 is shown in sect-ion a jewel or stone 20 carried by holding member 21, having a threaded extension 22 secured in the head 23 of stick pin 21. Layer 25 of hardened glass unites the threads of the two threaded members.

In the showing of the drawings it will be seen that'the article of the present invent-ion presents opposing and registering screw threads .spaced and united by a spirally corrugated glass body interposed between and combined with the threaded screw on the one side and the threaded plate or the like on the other and in cohering union with both. i

If desired, the water-glass employed may be colored by any alkali-withstanding dye stutl', but this is notordinarily necessary or desirable since where metal and metal are united the uniting layer of dry waterglass is invisible. Fillers, such as whiting and the like, may be employed in conjunction with the water-glass but their use is not desirable for the reason that they interfere wherever more or less well fitting screw threads are to be united. l/Vith such threads the space between is limited and it is not desirable to have granular bodies present. Small amounts of soluble fluorids, borates, chromates and the likcfmay be added to the water-glass to thin its consistency;.but they are not necessary, though sometimes desi rable.

I regard my invention as particularly ap-' plicahlc to the union of small metal screwswith threaded metal holding elements. The water-glass solution may be applied to either the screw or the socket, but it is ordinarily more convenient to apply it to the former.

l'Vhat; I claim is 2.-

1. .In an article of manufacture, the combination of a screw and its threaded socket with an intervening spirally corrugated continuous glass body interposed therebetween and in cohering union with said screw-and said socket.

2. In an article of inanutacture, the coinbination ofa screw and its threaded socket with an intervening spirally corrugated continuous body of hardened waterglass interposed therebetween and in coherlng llIlIOl'I wvith said screw and said socket.

3. In an article of manufactm'e, the com-' .bmatlon of a metal screw cmnprlsing noble metal and a threaded socket with an intervening spirally corrugated continuous glass body interposed therebetween and in cohering union with said screw and said socket.

4. In anarticle of manufacture, the combination of a metal screw comprising noble metal and a threaded socket with an intervening spirally corrugated continuous body ofhardened waterglass interposed therebetween andin cohering union with said screw and said socket.

5.'The process of uniting threaded elements which comprises coating the thread of one such element with a solution of waterglass, assembling the coated element with a ARTHURV. BRIESEN.

I Witnesses;

F. F. KIRKPATRICK, GEO. T. Hose. 

